Magnetic disk drive device

Details Magnetic disk drive device Magnetic disk drive device

1991-11-06

1995-01-03

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, 360 7303, G11B 5596, G11B 1546

Patent

active

053791665

ABSTRACT:
In a magnetic disk drive device comprises a magnetic disk having a plurality of concentric tracks on a data surface on which data are recorded. At least one of the tracks serves as a shipping area. Dedicated data is written in each of the data sectors in the shipping area and a DC erase section is formed in one of the data sectors in the shipping area. The dedicated data and the DC erase section are detected at the time of starting the rotation of the magnetic disk, and the speed of the disk is measured on the basis of the data thus obtained. The speed as obtained from the above data is monitored to determined when it has reached a predetermined value.

REFERENCES:
patent: 4530020 (1985-07-01), Sutton
patent: 4896240 (1990-01-01), Moriya et al.
patent: 4984100 (1991-01-01), Takayama et al.
patent: 5036508 (1991-07-01), Okano
patent: 5144504 (1992-09-01), Kitazawa

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